Lock for elevator-doors.



No. 678,422. Patented July l6, l90l.

N; POULSON. LOOK FOR ELEVATOR DOORS.

O, (Applicntiqn filed Aug. 28, 1899.) (No Iodel.)

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LOCK FOR ELEVATOR-=DOORS.

SPECIFICATION forming part of Letters Patent No. 678,422, dated July 16, 1901.

' Application filed August 28,1899. Serial No. 728,663. (No model.)

To rtZZ whom it nuty concern:

Be it known that I, NIELS POULSON, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Lock for Elevator-Doors, of which the following is a specification.

This invention relates to locks for sliding doors, and is especially adapted and designed for use upon elevator-doors, and more especially upon the doors of the elevator shaft or well, though it may be used upon the doors of the car.

The principal object of the invention is to provide a lock which will hold the door securely against opening. until the lock is tripped, and which look will also limit the movement of the doors in closing.

Another object of the invention is to provide means for tripping or unlocking thelock, such as may be reached and actuated by the elevator-car attendant before the car reaches the level of the floor, whereby immediately upon the car reaching such level he may open the door.

With these objects in View the invention consists in the formation, construction, and combination of parts, substantially as hereinafter set forth and claimed.

In the accompanying drawings, which form a part of this specification, Figures 1, 2, and 3 represent, respectively, in elevation and plan a single panel-door in its closed, haltopen, and full-open positions. Figs. 43, 5, and 6 are like representations of the application of the improved lock to a door having three movable panels or sections. Figs. 7, 8, and

9 are like representations of the invention applied to a door having two panels moving in opposite directions.

The lock consists of two or more links pivoted together and to the door-frame and door sections or panels in a manner such that when locked they will assume a straight line, preferably horizontal.

The sliding panel or door is indicated in Figs. 1, 2,'and 3 at 10. In the first of these figures it is shown in the closedposition and locked. In Fig. 2 it is partially open, while in Fig. 3 it is at its extreme open position. In this instance the lock has a link, as 11, which is pivoted to the door-jamb, and a link While these parts are in this position, the 7 door is securely locked. By tilting up the outer end of the link 13 the door 10 is started sliding backward and the pivotal points are thrown out of alinement, so that it is possible to open the door. The link 13 may be provided with any suitable tripping means; but when this improved lock is used on the elevator-well door it is preferable to connect to the outer end of the latch 13 a vertical rod, such as that shown at 14, which may be confined in suitable keepers, as indicated in the drawings, at its upper and lower ends. This form of tripping device makes it possible and convenient for the elevator attendant to trip the look as the caris brought to the landing, so that the door will be in readiness for open ing as soon as the car is stopped.

The rod 14 is intended as the means not only for tripping the look, but for grasping in the act of opening and closing the door.

,It will be readily seen that the series of links constituting the look also form a stop or device for limiting the movement of the door in closing, so that the hammering of the door against the door-jamb is avoided.

Obviously this form of look may be applied to a door consisting of more than one sliding panel or section, as is clearly indicated in Figs. 4, 5, and 6, where three sliding panels are shown, and in Figs. 7, 8, and 9, where two sliding panels are shown. In the last instance said panels recede from each other in opening. In this construction it will be only neoessary to apply the lock to one of the sliding panels, whose construction, therefore, will be the same as that illustrated in Figs. 1, 2, and 3. In multiplying the number of sections or sliding panels it is simply necessary to place upon the additional panels a counterpart of link 12, which will be pivoted at its ends to the adjacent links, as clearly shown in Figs. 4, 5, and 6. Where the door consists of several sections, a bracket may be secured to the rear edge of each section for supporting the link belonging to that section. Such brackets are shown at 15 in Figs. 4, 5, and 6. By this means the links constituting the lock are supported in substantially the same plane.

The links ll and 12 serve another function aside from limiting the forward move of the door-sections and locking them when closed. They serve to move the intermediate sections when the outer section is moved, as is clearly illustrated in Fig. 5.

The form of the links and their manner of support and likewise the location of the lock and also the form and location of the tripping device may be modified from those shown in the drawings without departing from the invention.

The invention claimed is- 1. The combination with a sliding door or panel of a link pivoted thereto, a link pivoted to the door post or jainb and to the other link, and a latch pivoted also to the doorand adapted to engage the free end of the first link, the pivots of the several links beingiu a straight line when the door is closed, thereby causing the chain of links to constitute a lock for the door and a stop for it in closing.

2. The combination with one or more sliding doors or panels, of links pivoted together and to the door-post and the door or doors at their middle in amannersuch that these pivots will be in a straight line when the doors are closed, and a latch engaging the free end of one of the links, and which on being tripped will move the links and throw the pivots out of alinement and permit the doors to be opened.

3. In an elevator door, the combination with one or more sliding doors or panels, of links pivoted together and to the door-post and the door or doors in a manner such that their pivots will be in a straight line when the doors are closed, a latch pivoted to the front edges of the door or doors, and a vertical tripping-rod extending along said edge and engaging with said latch whereby it may be tripped and the chain of links thrown out of alinement and the door unlocked, substantially as set forth.

4:. A door consisting of two or more adjacent sliding sections in combination with series of links extending across the sections and pivoted at their ends to one another and at their middles to the sections, and a link pivoted to the last of said links and to the doorjamb, the pivots of said links being in line with each other when the door is closed, for the purpose set forth.

Signed at New York, in the county of New York and State of New York, this 24th day of August, A. D. 1899.

NIELS POULSON.

Witnesses:

H. C. TOWNSEND, D. H. DECKER. 

